This image brings me to a question to the community at large:

Marc Jacquier (and others, I believe) have worked on the production of foam
in the shallow parts of seas. That was based on image-based height_field
functions, if I remember correctly, and it worked very well. I tried to use
the procedure with isosurfaces, but the only thing I got was foam over the
whole sea surface, not only in the shallows. What did I do wrong? Or how
should the expected results be obtained? Any suggestion is most welcome!!
Thanks indeed!

Thomas

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